Christopher Monsere and Karen Dixon provided training at Oregon State University for the ODOT Safety Investigation Manual (TREC project 555). The objective of this manual is to provide a resource to assist ODOT traffic investigators with highway safety project screening and evaluations. Though the content of this manual is targeted for use within ODOT, the procedures outlined could be easily adapted by local jurisdictions for similar highway safety assessments. This manual, therefore, includes checklists and analysis procedures suitable for a variety of field and office safety investigations and assessments. This manual also includes information about the ODOT highway safety programs and tools, linkage to current standards and resources where design and operations methods are stipulated, a comprehensive procedure for safety investigation at both intersection and highway segments, and countermeasure definition and guidance. The training materials can be viewed here: https://media.oregonstate.edu/media/ODOT+Safety+Investigations+Manual+-+part+4/0_56xxj6xk